Aromatic imidocarbonates

ABSTRACT

NOVEL IMIDOCARBONATE DERIVATIVES HAVING THE FORMULA:   AR-N=C(-Y-R2)-Z-R3   WHEREIN Y AND Z, WICH MAY BE THE SAME OR DIFFERENT, ARE INDIVIDUALLY AN OXYGEN OR SULFUR ATOM; AR IS AN UNSUBSTITUTED OR A HALOGEN- OR LOWER C1-C4 ALKYL (STRAIGHT OR BRANCHED)-SUBSTITUTED BENZENE OR PYRIDINE NUCLEUS, THE NUMBER OF THE SUBSTITUENTSS BEING 1 TO 3; R2 IS A C1-C18 ALKYL (STRAIGHT OR BRANCHED), C1-C18 ALKYL (STRAIGHT OR BRANCHED) HAVING 1 TO 3 HYDROXY RADICALS OR 1 TO 3 ALKOXYCARBONYL ( THE ALKOXY HAS 1 TO 4 CARBON ATOMS) RADICALS IN THE CARBON CHAIN, A C3-C10 CYCLOALKYL, A C2-C5 ALKENYL ALKYL (STRAIGHT OR BRANCHED), C1-C18 ALKYL (STRAIGHT OOR BRANCHED), A PHENYLALKYL, THE BENZENE NUCLEUS OF WHICH MMAY BE UNSUBSTITUTED OR SUBMITTED BY 1 TO 4 HALOGEN ATOMS, 1 TO 4 LOWER C1-C4 ALKYL (STRAIGHT OR BRANCHED) RADICALS OR A NITRO RADICAL, OR A HALOGEN- OR LOWER C1-C4 ALKYL (STRAIGHT OR BRANCHED-SUBSTITUTED PHENOXYALKYL; R3 IS A C1-C18 ALKYL (STRAIGHT OR BRANCHED) HAVING 1 TO 3 HYDROXY RADICALS OR 1 TO 3 ALKOXYCARBONYL (THE ALKOXY HAS 1 TO 4 CARBON ATOMS) RADICALS IN THE CARBON CHAIN A C2-C5 ALKENYL (STRAIGHT OR BRANCHED), A C3-C6 ALKYNYL (STRAIGHT OR BRANCHED) OR A PHENYALKYL, THE BENZENE NUCLEUS OF WHICH MAY BE UNSUBSTITUTED OR SUBSTITUTED BY 1 TO 4 HALOGEN ATOMS, 1 TO 4 LOWER C1-C4 ALKYL (STRAIGHT OR BRANCHED) RADICALS, A NITRO RADICAL OR AC2-C4 ALKYLENE RADICAL, PROVIDED THAT IN CASE AR IS AN UNSUBSTITUTED OR SUBSTITUTED BENZENE NUCLEUS AND R2 AND R3 ARE PHENYLALKYL GROUPS, THE BENZENE NUCLEUS OF AT LEAST ONE OF SAID PHENYLALKYL GROUPS HAS A SUBSTITUENT, HAVE STRONG MICROBICIDAL ACTIVITIES ON A WIDE SCOPE OF MICROORGANISMS.

United States Patent 3,832,351 AROMATIC IMIDOCARBONATES Shizuya Tanaka, Minoo, Toshiaki Ozaki and Akihiko Mine, Toyonaka, Katsutoshi Tanaka, Takarazuka, Sigeo Yamamoto, Toyonaka, Tadashi Ooishi, Takarazuka, Naganori Hino, Toyonaka, and Takeo Satomi, Takarazuka, Japan, assignors to Sumitomo Chemical Company, Limited, Osaka, Japan No Drawing. Continuation-impart of abandoned application Ser. No. 133,744, Apr. 13, 1971. This application Mar. 27, 1972, Ser. No. 238,537

Claims priority, application Japan, Apr. 21, 1970, 45/ 34,457; Nov. 22, 1971, 46/923,874 Int. Cl. C07d 31 /50 US. Cl. 260-2943 E 7 Claims ABSTRACT OF THE DISCLOSURE Novel imidocarbonate derivatives having the formula:

wherein Y and Z, which may be the same or different, are individually an oxygen or sulfur atom; Ar is an unsubstituted or a halogenor lower C -C alkyl (straight or branched)-substituted benzene or pyridine nucleus, the number of the substituents being 1 to 3; R is a C C alkyl (straight or branched), C C alkyl (straight or branched) having 1 to 3 hydroxy radicals or 1 to 3 alkoxycarbonyl (the alkoxy has 1 to 4 carbon atoms) radicals in the carbon chain, a C C cycloalkyl, a C -C alkenyl alkyl (straight or branched), C C alkyl (straight or branched), a phenylalkyl, the benzene nucleus of which may be unsubstituted or submitted by 1 to 4 halogen atoms, 1 to 4 lower C -C alkyl (straight or branched) radicals or a nitro radical, or a halogenor lower C -C alkyl (straight or branched-substituted phenoxyalkyl; R3 is a C -C alkyl (straight or branched) having 1 to 3 hydroxy radicals or 1 to 3 alkoxycarbonyl (the alkoxy has 1 to 4 carbon atoms) radicals in the carbon chain, a C -C alkenyl (straight or branched), a C -C alkynyl (straight or branched) or a phenylalkyl, the benzene nucleus of which may be unsubstituted or substituted by 1 to 4 halogen atoms, 1 to 4 lower C -C alkyl (straight or branched) radicals, a nitro radical or a C 43 alkylene radical, provided that in case Ar is an unsubstituted or substituted benzene nucleus and R and R are phenylalkyl groups, the benzene nucleus of at least one of said phenylalkyl groups has a substituent, have strong microbicidal activities on a wide scope of microorganisms.

CROSS-REFERENCES TO OTHER APPLICATIONS This application is a continuation-in-part application of application Ser. No. 133,744 filed Apr. 13, 1971 now abandoned.

The present invention relates to novel imidocarbonate derivatives, process for preparing said compounds and non-medical microbicides containing said compounds as active ingredients.

In accordance with the present invention, there are provided novel imidocarbonate derivatives represented by the formula (1):

Ar-N=O wherein Y and Z, which may be the same or different, are individually an oxygen or sulfur atom; AI is an un- 3,832,351 Patented Aug. 27, 1974 ice substituted or halogenor lower C C, alkyl (straight or branched)-substituted benzene nucleus or an unsubstituted or halogenor lower C -C alkyl (straight or branched)-substituted pyridine nucleus, the number of the substituents being 1 to 3; R is a C C alkyl (straight or branched), a C -C alkyl (straight or branched) having 1 to 3 hydroxy radicals or 1 to 3 alkoxycarbonyl (the alkoxy has 1 to 4 carbon atoms) radicals in the carbon chain, a C C cycloalkyl, a C C alkenyl (straight or branched), a C -C alkynyl (straight or branched), a phenylalkyl, the benzene nucleus of which may be unsubstituted or substituted by 1 to 4 halogen atoms, 1 to 4 lower C -C alkyl (straight or branched) radicals or a nitro radical, or a halogenor lower C -C alkyl (straight or branched)-substituted phenoxyalkyl; R is a C C alkyl (straight or branched) having 1 to 3 hydroxy radicals or 1 to 3 alkoxycarbonyl (the alkoxy has 1 to 4 carbon atoms) radicals in the carbon chain, a C -C alkenyl (straight or branched), a C -C alkynyl (straight or branched) or a phenylalkyl, the benzene nucleus of which may be unsubstituted or substituted by 1 to 4 halogen atoms, 1 to 4 lower C -C alkyl (straight or branched) radicals, a nitro radical or C -C alkylene radical, provided that in case Ar is an unsubstituted or substituted benzene nucleus and R and R are phenylalkyl groups, the benzene nucleus of at least one of said phenylalkyl groups has a substituent; processes for preparing said compounds; and non-medical microbicides containing said compounds as active ingredients.

A preferred imidocarbonate derivative is represented by the formula:

wherein Y is the same as defined above R is a C -C alkyl (straight or branched), a C -C cycloalkyl or a lower C -C alkyl (straight or branched)-substituted benzyl radical.

In the definitions of Ar, R R and R examples of the lower alkyl are preferably methyl, ethyl, propyl, isopropyl, isobutyl, n-butyl, t-butyl, etc.; examples of the alkenyl are vinyl, allyl, crotyl, butenyl, etc.; examples of the alkynyl are preferably propargyl, etc.; examples of phenylalkyl are preferably benzyl, phenethyl, a-methyl benzyl, phenylpropyl, etc.; examples of the halogen are chlorine, bromine, fluorine and iodine, examples of the alkoxycarbonyl are preferably methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, etc.; and examples of the cycloalkyl are preferably cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, methylcyclopentyl, etc.

The above-mentioned imidocarbonate derivatives are synthesized by the following processes:

Synthesis process (A) A thionocarbamic or dithiocarbamic acid ester derivative represented by the general formula (II):

wherein Ar, R and Y are the same as defined above, is reacted with an organic halide represented by the general formula (III):

wherein R is the same as defined above; and X is a halogen atom.

Synthesis process (B) An isocyanic acid dichloride derivative represented by the general formula (IV):

Ar-N=C 01 (IV) wherein Ar is the same as defined above, is reacted with an alkali metal alcoholate or mercaptide derivative represented by the general formula (V):

wherein R and Y are the same as defined above; and M is an alkali metal atom.

Synthesis process (C) An imidocarbonate chloride derivative represented by the general formula (VI):

.ArN=C 01 I) wherein Rr and R are the same as defined above, is

reacted with an alkali metal alcoholate or mercaptide derivative represented by the general formula (VII):

R Z-M (VII) wherein R Z and M are the same as defined above.

Synthesis process (D) A dialkali metal imidodithiocarbonate derivative represented by the general formula (VIII):

S M (VIII) wherein Ar and M are the same as defined above, is reacted with an organic halide represented by the general formula (IX):

wherein R and X are the same as defined above.

Several imidocarbonate, imidomonothiocarbonate and imidodithiocarbonate derivatives have been well known hitherto. However, all the compounds of the present invention are novel, and the present inventors have found, as the result of extensive studies, that these compounds have strong microbicidal effects on an extremely wide scope of microorganisms. They have prominent efiects on such a wide scope of microorganisms as rice blase (Pyricularia oryzae), helminthosporium leaf spot (Cochliobolus miyabeanus), sheath blight (Pellicularia sasakii), bacterial leaf blight (Xanthomonas oryzae), and the like pathogens of rice plants, and sclerotinia rot (Sclerotinia sclerotiorum), brown rot (Sclerotinia frunctigena), gray mold (Botrytis cinerea), cork spot (Alternaria mall), blossom blight (Sclerotinia mali), powdery mildew (Erysiphe cichoracearum), alternaria leaf spot (Alternaria brassicae), damping-off (Pythium debaryanum), bacterial canker (Corynabacterium mz'chiganense), ripe rot (Glomerella cingulata), southern blight (Corticium rolfsii) and the like pathogens of agricultural and horiticultural crops, and are markedly excellent plant disease-controlling chemicals capable of controlling 2 or more kinds of plant diseases at the same time. Further, the present compounds are effective for the control of molds propagating in industrial products and hence are excellent as industrial microbieides and also have herbicidal activities. Moreover, they are extremely low in toxicity and scarcely have detrimental actions on mammals and fishes.

The synthesis process (A) is carried out in such a manner that to a solution of 1 mole of the said thionocarbamic or dithiocarbamic acid ester derivative (II) in methanol, ethanol, tetrahydrofuran, dioxane, DMSO or DMF are added 1 to 2 moles of the halide (DI) and 1 to 1.5 moles of a base (e.g. a hydroxide of an alkali or alkaline earth metal such as NaOH, KOH or Ca(OH) or an alkali metal alcoholate such as NaOCH NaOC H or KOCH or tertiary amines such as triethylamine, pyridine or N,N- dimethylaniline) for neutralizing the hydrohalic acid which is formed at the time or reaction, and the resulting mixture is reacted. In this case, there may be adopted either the procedure that the base is first added to the solution of carbamic acid ester derivative and then the organic halide is added, or the procedure that the organic halide is first added to the solution of carbamic acid ester derivative and then the base is added. The reaction is efiected by stirring the resulting mixture at such a mild temperature condition as at 0 to C. for 1 to 4 hours. After completion of the reaction, the reaction mixture is poured into an excess amount of water, and the resulting crystal or oil layer is separated by filtration or by extraction with a Water-immiscible organic solvent such as benzene, toluene, ethyl acetate, ether or the like.

The synthesis process (B) is carried out in such a manner that a solution or suspension of 2 to 3 moles of the alkali metal alcoholate or mercaptide derivative (V) in an alcohol such as methanol or ethanol, an ether such as ether, dioxane or tetrahydrofuran, or a hydrocarbon such as benzene or toluene is mixed with 1 mole of the isocyanic acid dichloride derivative (IV), and the resulting mixture is reacted to obtain a desired product. The reaction may be effected at any temperature within the range of 10 C. to 100 C. Since the reaction is exothermic, the starting materials are ordinarily mixed at a temperature of the lower side of -10 to 40 C. and the resulting mixture is maintained at said temperature for 3 to 4 hours, or maintained at 40 to 100 C. for 1 to 2 hours. An alkali metal salt formed during the reaction is separated by filtration or by dissolution in water, and then the oil layer is extracted with a waterimmiscible organic solvent, whereby the product can be isolated. The product may be further purified by distillation or recrystallization.

The synthesis process (C) characteristically differs from the synthesis process (B) in that 1 to 1.5 moles of the alkali metal alcoholate or mercaptide derivative (VII) per mole of the imidocarbonate chloride derivative (VI) is used to make it possible to optionally obtain, by selection of reaction reagents, a compound of the general formula (I), in which Y and Z or R and R are the same as or ditferent from each other. The reaction temperature and time and the treatment, after operations, are the same as in the synthesis process (B).

The synthesis process (D) is carried out in such a manner that 1 mole of the dialkali metal imidodithiocarbamate (VIII) is reacted with 2 to 3 moles of the organic halide (IX), whereby a desired product can be obtained. The reaction solvent may be selected from the group consisting of water, alcohol, acetone, DMF, dioxane, tetrahydrofuran, etc., and a mixture thereof. It is, of course, possible to use the dialkali metal imidodithiocarbamate (VIII) in an isolated form. It is also possible that 1 mole of the starting amine, 1 mole of carbon disulfide and 2 moles of an alkali metal hydroxide are mixed in the above-mentioned reaction solvent, and the resulting mixture is reacted as it is, i.e. without isolation, with the organic halide (DC). In case a chloride, which is low in reactivity, is used as the organic halide, it is of course possible to carry out the reaction in the presence of such a catalyst as sodium bromide, potassium bromide, sodium iodide, potassium iodide, or pyridine, triethylamine or the like. The reaction may be etfected at a temperature within the range of 0 to 100 C., preferably 0 to 70 C. Ordinarily, the reaction terminates within 1 to 4 hours. After the reaction, the reaction mixture is poured into water to dissolve the formed alkali metal halide, and the resulting crystal or oily substance is recovered by filtration or extraction to obtain a desired product.

In actual application, the thus obtained compounds of the present invention may be applied as they are or may be formulated into any of such preparations as granules, dusts, wettable powders and emulsifiable concentrates. it is desirable that these preparations are suitably used according to the kinds and sizes of crops and to application purposes.

In formulating these preparations, there may be used such solid carriers as talc, bentonite, clay, kaolin, diatomaceous earth, vermiculite, slaked lime, etc.; such liquid carriers as benzene, alcohols, acetone, xylene, dioxane, methyl naphthalene, cyclohexanone, etc.; and such surfactants (wetting agents and emulsifiers and the like) and binders, as alkyl sulfates, al'kyl sulfonates, aryl sulfonates, polyethylene glycol ethers, polyhydric alcohol esters, polyoxyethylene alkylphenyl phenol ether, ligninsulfonic acid alkali metal salt, alkylbenzenesulfonic acid alkali metal salt, polyvinyl alcohol, etc. In application, these prepartions may not only be used in admixture with agricultural surface active agents such as spreaders and the like to expect the enhancement and accuracy of the effectiveness thereof, but also be used in admixture with such agricultural chemicals as fungicides, insecticides, nematocides, herbicides, etc. and fertilizers.

The present invention is illustrated in further detail with reference to examples, but it is needless to say that the kinds of starting materials used for preparation of the present compounds; the reaction conditions, and the kinds and mixing proportions of additives for the present compounds are variable over wide scopes without being limited only to those set forth in the examples.

EXAMPLE l.-SYNTHESIS PROCESS (A) Synthesis of N-3,4-dichlorophenyl-O-methyl-S-p-chlorobenzylimido-thiocarbonate (Compound No. 58)

In a solution of 5.6 g. (0.1 mole) of potassium hydroxide in 50 ml. of methanol was dissolved at room temperature 23.6 g. (0.1 mole) of N-3,4-dichlorophenyl- O-methylthionocarbamate. Into this solution was dropped at C. to 20 C. 16.1 g. (0.1 mole) of p-chlorobenzyl chloride, and the resulting mixture was stirred at said temperature for 2 hours. Subsequently, the reaction mixture was poured into 300 ml. of water, and an oil layer formed was extracted with ethyl acetate and washed once with water. Thereafter, the extract was dried with anhydrous sodium sulfate, and then the solvent was removed by evaporation, whereby 33.0 g. of an oily substance was obtained. This oily substance was charged with 50 ml. of n-hexane, and the resulting mixture was stirred at room temperature, whereby fine needle-like crystals were formed. The crystals were obtained by filtration and then dried to obtain 31.4 g. of N-3,4-dichloro-O- methyl-S-p-chlorobenzylimido-thiocarbonate, yield 87%.

EXAMPLE 2.SYNTHESIS PROCESS (B) Synthesis of N2,5-dichlorophenyl-0,0-di(a-ethoxycarbonylethyl) imidocarbamate (Compound No. 63)

Into a suspension of 30.8 g. (0.22 mole) of sodium salt of ethyl ot-hydroxypropionate in 300 ml. of dry ether was dropped 24.3 g. (0.1 mole) of 2,5-dichlorophenyl isocyanic acid dichloride with stirring and with cooling at room temperature. The resulting mixture was heated under reflux for 1 hour and then poured into 200 ml. of water to dissolve sodium chloride formed. Subsequently, the ether layer was washed once with water and dried with anhydrous sodium sulfate, and then the ether was removed by distillation under reduced pressure to obtain 32.9 g. of N-2,5-dichorophenyl-0,0-di(u-ethoxycarbonylethyl) imidocarbonate, yield 87%.

6 EXAMPLE 3.SYNTHESIS PROCESS (C) Synthesis of N-3-pyridyl-O-butyl-S-3,4-dichlorobenzyl imidothiocarbonate (Compound No. 38)

-Into a solution of 0.12 mole of sodium 3,4-dichlorobenzyl mercaptide in 200 ml. of methanol was dropped with stirring at 0 to 5 C. over a period of 1 hour 21.2 g. (0.1 mole) of N-3-pyridyl-O-butylimidocarbonate chloride, and the resulting mixture was allowed to stand at room temperature for 3 hours. Subsequently, the reaction mixture was poured into 650 ml. of water, and then extracted with 200 ml. of benzene. Subsequently, the henzene layer was washed once with water and dried with anhydrous magnesium sulfate, and then the benzene was removed by evaporation to obtain 30.1 g. of the desired compound in an oily form.

EXAMPLE 4.SY-NTHESIS PROCESS (D) Synthesis of N-3-pyridyl-S,S'-di-2-chlorobenzylimidodithiocarbonate (Compound No. 14)

To a solution of 11.2 g. (0.2 mole) of caustic potash in a mixed solvent comprising 60 ml. of ethanol and 20 ml. of water was added 9.4 g. (0.1 mole) of 3-aminopyridine. To the resulting mixture was added 7.6 g. (0.1 mole) of carbon disulfide at 10 to 20 C. with stirring over a period of 1.5 hours. After allowing to stand at room temperature for 2 hours, the mixture was cooled to 5 to 15 C., and then 35.4 g. (0.22 mole) of Z-chlorobenzyl chloride was dropped into the reaction mixture over a period of 1.5 hours. Thereafter, the reaction mixture was poured into 200 ml. of water, and an oil layer formed was extracted with ethyl acetate, and the extracts were washed once with water and then dried with anhydrous sodium sulfate. Subsequently, the solvent was removed by distillation under reduced pressure to obtain 35.5 g. of N-3-pyridyl-S,S-di-Z-chlorobenzyl-imidodithiocarbonate, yield EXAMPLE 5 Synthesis of N 3-pyridiyl-S,S'-di-2-chlorobenzylimidodiimidodithiocarbonate (Compound No. 84)

In ml. of methanol was dissolved 2.3 g. (0.1 mole) of metallic sodium and 31.6 g. (0.1 mole) of p-t-butylbenzyl-N-Ia-pyridyl dithiocarbamate was then added to the resulting solution at 15 C. to dissolve it in the solution. Into the thus obtained solution was dropped at 15-20 C. 15.1 g. (0.11 mole) of n-butyl bromide (n-C H Br). The resulting mixture was maintained at said temperature for 2 hrs. and then at 40 C. for 1 hr. The resulting reaction mixture was poured into 400 ml. of iced water, and the separated oil material was extracted with 200 ml. of ethyl acetate. The thus obtained ethyl acetate layer was once washed with 200 ml. of water, dried with anhydrous sodium sulfate and then subjected to distillation under reduced pressure to obtain 33.1 g. (yield: 89%) of a pale yellow, oily material.

EXAMPLE 6 Synthesis of N-3-pyridyl-O-n-butyl-S-p-t-butylbenzylimidothiocarbonate (Compound No. 96)

In 70 ml. of methanol was dissolved 4.4 g. (0.11 mole) of sodium hydroxide, and 21 g. (0.1 mole) of n-butyl- N-3-pyridylthionocarbamate was then dissolved therein at 20 C. To the resulting solution was added dropwise 22.7 g. (0.1 mole) of t-butylbenzyl bromide at 20-25 C. The resulting mixture was maintained at said temperature for 1.5 hrs., after which the reaction mixture was poured into 300 ml. of iced water and subjected to extraction with 200 ml. of ethyl acetate. The resulting ethyl acetate layer was treated in the same manner as in Example 5 to obtain an oil, which was solidified after being allowed to stand at room temperature overnight. 

